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	Provides codecs for representing labelled dominance graphs in various
	graph representation languages. The following codecs are currently defined:
	
	<ul>
		<li>domgraph-gxl (input, output): dominance graphs in the GXL
		graph representation format;</li>
		<li>domgraph-udraw (output): dominance graphs in the concrete syntax
		of the uDraw(Graph) graph drawing system.</li>
		<li>domgraph-dot (output): dominance graphs in the Dot representation language.</li>
	</ul>
			
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